JPH08156070A - Material feeder - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To manufacture at low cost. Prevents material retention and improves extrusion performance. A screw (4) is installed inside a cylinder (1) having a material supply port (11) at its tip, and a material (P) is moved from a gap between the cylinder (1) and the cylinder (1) by a screw (4) rotatably driven by a drive unit (5). Extrude to the material supply port 11.
The screw 4 and the drive unit 5 allow the screw 4 to advance and retreat in the axial direction, and cause the rotating screw 4 to retract in response to the pressure of the material P, so that the screw 4 that has stopped rotating resists the pressure of the material P. They are connected via a slide connecting mechanism 6 that moves forward and backward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of an extrusion type material supply device for supplying a material having a low viscosity such as a hot melt material.

[0002]

2. Description of the Related Art Conventional material supply devices include, for example,
The one described in JP-B-52-44783 is known.

In this conventional material supply device, a screw is installed inside a cylinder having a material supply port at its tip, and the material is supplied to the cylinder from a gap between the cylinder and the screw by a screw rotationally driven by a drive unit. It is extruded to the mouth, and slip is prevented by forming the cylinder and the screw in a two-step diameter for a material made of low-viscosity hot melt material.

[0004]

The above-mentioned conventional material supply device has a problem that the manufacturing cost increases because the entire structure becomes complicated. Further, since the path of the gap between the cylinder and the screw in which the material flows becomes complicated, the material tends to stay in the middle of the gap and the extrusion performance is low.

The present invention has been made in consideration of the above problems, and an object thereof is to provide a material feeding apparatus which can be manufactured at a low cost and has a high extrusion performance in which the material does not stay. .

[0006]

In order to solve the above problems, the material supply apparatus according to the present invention employs the following means.

That is, according to the first aspect of the present invention, the screw is internally provided in the cylinder having the material supply port at the tip thereof, and the material is supplied from the gap between the cylinder and the screw by the screw which is rotationally driven by the drive unit. In the material feeding device that extrudes into the screw, the screw and the drive unit enable the screw to advance and retreat in the axial direction, move the rotating screw back in response to the pressure of the material, and stop the screw from rotating to the pressure of the material. It is characterized in that they are connected via a slide connection mechanism that moves forward against them. The material is kneaded by the rotation of the screw and pushed out to the material supply port side through the gap around the screw, so that the pressure in the gap increases and the screw retreats. The material is extruded by the screw which has stopped rotating.

According to a second aspect of the present invention, in the material feeding device according to the first aspect, the slide coupling mechanism includes a slide portion in which the screw and the driving portion are slidably fitted in a non-round cross-sectional shape, and the screw is elastically pressed toward the tip side. It is characterized by comprising a spring member for urging. This slide coupling mechanism can be added by modifying an existing product.

According to a third aspect of the present invention, in the material supply device according to the first or second aspect, the inner surface of the tip of the cylinder and the tip of the screw have a contact structure capable of opening and closing the material supply port of the cylinder. Is characterized by. As the material advances, the tip of the material comes into contact with the cylinder to close the material supply port.

A fourth aspect of the present invention is characterized in that, in the material supply device according to any one of the first to third aspects, at least the tip of the screw has a conical shape. The conical area causes the screw to respond and retract, closing the material feed opening over the area.

A fifth aspect of the present invention is characterized in that, in the material supply device according to any of the first to fourth aspects, auxiliary screws are arranged radially outside the screw inside the cylinder. It is pre-kneaded by the auxiliary screw to promote plasticization of the material.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a material supply apparatus according to the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment (1) of a material supply apparatus according to the present invention.

In this embodiment, a material suitable for supplying the material P made of a hot melt material is shown.

This embodiment is of a vertical type which adopts the basic structure of a synthetic resin material extrusion molding machine, and comprises a cylinder 1, a heater 2, a hopper 3, a screw 4, a drive unit 5, and a slide connecting mechanism 6. It is configured.

The cylinder 1 is not a two-step type as in the above-mentioned conventional example but is formed in a cylindrical shape having the same diameter continuously, and is a nozzle type in which the melted material P is extruded at the lower end (tip). The material supply port 11 is provided, and the upper end (rear end) of the material supply port 11 is used as the input port 12 for the material P such as particles. The inner surface 13 of the lower end portion of the cylinder 1 is formed in a conical shape that is inclined downward toward the material supply port 11.

The heater 2 has a band shape and is attached so as to enclose the outer peripheral surface 14 of the cylinder 1.
The heater 2 heats and melts the material P in the gap S between the cylinder 1 and the screw via the cylinder 1.

The hopper 3 is formed in the shape of a cone that spreads upward and is connected to the inlet 12 of the cylinder 1. The hopper 3 accumulates and stores the material P such as particles, and gradually drops the material P into the charging port 12 of the cylinder 1.

The screw 4 comprises a shaft portion 41 and a spiral groove portion 42 provided on the peripheral surface of the shaft portion 41. The screw 4 is internally mounted in the cylinder 1 through the gap S so as to be able to advance and retreat in the axial direction, and is rotationally driven by the drive unit 5. The rotation of the screw 4 causes the granular material P in the gap S to be rotated.
Is melted and plasticized by utilizing the heating of the heater 2, and the melted and plasticized material P is delivered to the material supply port 11 of the cylinder 1. Further, the lower end portion (tip portion) of the shaft portion 41 of the screw 4
43 is formed in a conical shape corresponding to the inner surface 13 of the lower end portion of the cylinder 1, and can come into contact with the conical area in a closeable manner.

The drive unit 5 comprises an electric motor 51 and a motor shaft 52 connected to the electric motor 51. The drive unit 5 is arranged coaxially with the shaft 41 of the screw 4, and the motor shaft 52 is connected to the shaft 41 of the screw 4 via the slide connection mechanism 6.

The slide connecting mechanism 6 includes a slide portion 61 having a so-called D-cut structure and a spring material 6 of a coil spring.
Consists of two. As shown in detail in FIGS. 2 and 3, the slide portion 61 has a D-shaped cross section in the vicinity of the upper end portion (rear end portion) 44 of the shaft portion 41 of the screw 4 and extends in the axial direction of the shaft portion 41. An extended slide groove 611, a retaining flange 612 provided on the upper end portion 44 of the shaft portion 41 of the screw 4 adjacent to the slide groove 611, and a retaining flange fixed to the lower end portion of the motor shaft 52 of the drive unit 5 to prevent the inside from retaining. A sleeve bag-shaped nut 613 that allows the 612 to slide, and a nut hole 614 having a D-shaped cross section that is cut out from the nut 613 and fits into the slide groove 611. In addition,
The spring material 62 is housed inside the nut 613 of the slide portion 61 and elastically presses the retaining flange 612.

The cover 7 is formed in a tubular shape and is fixed to the nut 613 of the slide portion 61 of the slide coupling mechanism 6,
It is loosely fitted to the upper end of the screw 4. Therefore, the slide groove 611 and the nut hole 614 of the slide portion 61 of the slide coupling mechanism 6 are covered with the cover.

According to the embodiment configured as described above, the slide connecting mechanism 6 is attached to the structure of the cylinder 1 and the screw 4. Further, the slide connecting mechanism 6 is composed of a mechanical element having a simple structure which can be attached by simple processing and assembling work. Therefore, it can be manufactured at low cost and the existing extruder for synthetic resin material can be easily modified.

In the use of the embodiment thus configured, when the electric motor 51 of the drive unit 5 is rotated,
The motor shaft 52 of the drive unit 5 rotates and the nut 613 of the slide unit 61 of the slide connecting mechanism 6 rotates. The rotation of the nut 613 of the slide portion 61 of the slide connecting mechanism 6 is
The rotation of the slide groove 611 of the slide portion 61 of the slide connecting mechanism 6 fitted in the nut hole 614 is caused to rotate the shaft portion 41 of the screw 4.

When the shaft portion 41 of the screw 4 rotates, the material P in the gap S is kneaded. At this time, the material P is heated to a high temperature by the heater 2. This kneading,
The heated material P is supplied to the spiral groove portion 42 of the screw 4.
Is guided and flowed through the gap S to be melted and plasticized.

The melt-plasticized material P raises the pressure inside the gap S and causes the screw 2 to retract (raise). That is, the slide groove 611 of the slide portion 61 of the slide connecting mechanism 6 moves backward against the spring material 2 while being fitted in the nut 613 by the nut hole 614. At this time, since the lower end portion 43 of the screw 4 has a conical shape and the area on which the pressure of the material P acts is large, the responsiveness of the backward movement of the screw 4 is good.

As a result, as shown in FIG. 5, the cylinder 1
The lower end 43 of the screw 4, which is in contact with the inner surface 13 of the lower end of the cylinder 4, is released, the material supply port 11 of the cylinder 1 is opened, and the material P is extruded.

During the flow of the material P during this period, the cylinder 1,
Since the structure of the screw 2 is simple and the path of the gap S is simple, the screw 2 moves forward smoothly without formation of retention. Therefore, the heating time of the material P made of a hot melt material that is melted at a considerably high temperature is not extended and thermally deteriorated.

To stop the extrusion of the material P, the rotation of the electric motor 51 of the drive unit 5 is stopped.

When the rotation of the electric motor 51 of the drive unit 5 is stopped, the pressurization of the material P by the screw 4 is stopped, and the screw 4 is returned to the forward direction. That is, the retaining flange 612 of the slide portion 61 of the slide coupling mechanism 6 is elastically pressed by the spring member 2 of the slide coupling mechanism 6, and the slide groove 611 of the slide portion 61 of the slide coupling mechanism 6 becomes the nut 613 by the nut hole 614. Move forward with the mated state.

As a result, the lower end 4 of the screw 4 moving forward
3 extrudes the material P remaining in the vicinity of the material supply port 11 of the cylinder 1 and contacts the inner surface 13 of the lower end of the cylinder 1,
The material supply port 11 of the cylinder 1 will be closed. When the material supply port 11 of the cylinder 1 is closed, as shown in FIG. 4, the extrusion of the material P is completely stopped and no leakage occurs. Therefore, the material P to be extruded can be quantified by opening and closing the material supply port 11 of the cylinder 1 by advancing and retracting the screw 4.

When the screw 4 is retracted as described above, the material P attached to the upper end of the screw 4 is removed by the cover 7, so that the material P is slid on the slide portion 6 of the slide coupling mechanism 6.
The first nut hole 614 does not enter the inside of the nut 613. Therefore, the forward / backward movement of the screw 4 is smoothly continued.

Since the entire structure is vertical, gravity can be applied to the forward / backward movement of the screw 4 and the like, so that the operation of each part becomes smooth.

FIG. 6 shows an embodiment (2) of the material supply apparatus according to the present invention.

In this embodiment, the heater 2 is also attached to the outside of the hopper 3 of the first embodiment described above.

According to this embodiment, since the material P put in the hopper 3 can be immediately melted, the material P can be melted even if the axial length L of the cylinder 1 and the screw 4 for heating and kneading the material P is shortened. It can be brought into a predetermined plasticized molten state. Therefore, the size of the entire device can be reduced. Further, since the material P in the hopper 3 is melted, the hopper 3
Therefore, there is no difference in the fluidity of the continuous material P between the material supply ports 11 of the cylinder 1. Therefore, the drive unit 51 described above
The forward movement of the screw 4 accompanying the stop of the rotation of the motor 51 is smoothly performed, and the accuracy of the quantitativeness of the supply of the material P is improved.

In this embodiment, when the molten material P is supplied to the hopper 3, the above-mentioned action and effect are further promoted. Further, in addition to the case where the material P is supplied and stopped by advancing and retracting the screw 4, a separate on-off valve can be provided to control the supply and stop of the material P.

FIG. 7 shows an embodiment (3) of the material supply apparatus according to the present invention.

In this embodiment, the conical axial length between the inner surface 13 of the lower end of the cylinder 1 and the lower end 43 of the screw 4 is increased. The gap S is formed by removing the spiral groove portion 42 of the screw 4 and engraving the spiral groove 15 on the inner surface of the cylinder 1. Also,
Two inlets 12 of the cylinder 1 are opened on the side surface of the cylinder 1 in a window shape, and the hopper 3 is removed.

According to this embodiment, since the material P is plasticized at the conical portion of the lower end portion 43 of the screw 4 and a high torque is applied to the material P, the plasticization accuracy of the material P is improved. Further, since the conical area of the lower end portion 43 of the screw 4 on which the pressure of the material P acts is large,
The backward response of the screw 4 becomes better.

Furthermore, according to this embodiment, the spiral groove 15 of the cylinder 1 allows the continuous material P such as a cord to be wound into the space S. Further, since the two inlets 12 of the cylinder 1 are opened, two kinds of materials P can be introduced into the gap S at the same time.

FIGS. 8 and 9 show an embodiment (4) of the material supply apparatus according to the present invention.

In this embodiment, auxiliary screws 4'are arranged radially outside the screw 4 inside the cylinder 1. In this auxiliary screw 4 ', a spiral groove portion 42' is provided in a direction opposite to the spiral groove portion 42 of the screw 4 with respect to the shaft portion 41 ', and is rotated in a direction opposite to the screw 4.

According to this embodiment, since the material P is plasticized even between the screw 4 and the auxiliary screw 4 ', the plasticization accuracy of the material P is further enhanced. Although the heater 2 is provided on the outer periphery of the hopper 3, even if the heater 2 is not provided, the plasticized state is sufficient.

Incidentally, the auxiliary screw 4'may be constructed so as to be able to advance and retreat like the screw 4. Further, by controlling the rotation of the auxiliary screw 4'corresponding to the material of the material P, the plasticization accuracy of the material P can be further enhanced.

As described above, in addition to the illustrated embodiment, a horizontal embodiment in which the screw 4 is advanced and retracted in the horizontal direction can be adopted.

Further, according to the material of the material P, the heater 2 may be omitted or other auxiliary mechanism may be attached.

Furthermore, the fitting structure of the slide connecting mechanism 6 may be other than the D-shape.

[0049]

As described above, the material supply device according to the present invention has almost the same structure of the cylinder, screw, etc. as the conventional general synthetic resin material extrusion molding machine, and the overall structure is simple. In addition to the fact that the material can be manufactured at low cost and the path of the gap through which the material flows is simple, there is an effect that the flowing material does not accumulate.

[Brief description of drawings]

FIG. 1 is an embodiment (1) of a material supply apparatus according to the present invention.
It is a front sectional view showing.

FIG. 2 is an enlarged sectional view taken along line XX of FIG.

FIG. 3 is an enlarged cross-sectional view taken along line YY of FIG.

FIG. 4 is an enlarged view of a main part showing the operation of FIG.

5 is an enlarged view of an essential part showing another operation of FIG. 1. FIG.

FIG. 6 is an embodiment (2) of the material supply apparatus according to the present invention.
It is a front sectional view showing.

FIG. 7 is an embodiment (3) of the material supply device according to the present invention.
It is a front sectional view showing.

FIG. 8 is an embodiment (4) of the material supply apparatus according to the present invention.
It is a front sectional view showing.

9 is a simplified plan view of a main part of FIG.

[Explanation of symbols]

 1 Cylinder 11 Material Supply Port 13 Inner Surface 2 Heater 3 Hopper 4 Screw 43 Tip (Lower End) 4'Auxiliary Screw 5 Drive Part 6 Slide Connection Mechanism 61 Slide Part 62 Spring Material S Gap P Material

Claims (5)

[Claims] 1. A material supply in which a screw is internally provided in a cylinder having a material supply port at its tip, and the material is extruded from a gap between the cylinder and the screw to a material supply port of the cylinder by a screw which is rotationally driven by a driving unit. In the device, the screw and the drive unit allow the screw to advance and retreat in the axial direction, the rotating screw is moved backward in response to the pressure of the material, and the screw whose rotation is stopped is moved forward against the pressure of the material. A material supply device characterized by being connected via a slide connecting mechanism. 2. The material supply device according to claim 1, wherein the slide connecting mechanism comprises a slide portion in which a screw and a driving portion are slidably fitted in a non-round circular cross-sectional shape, and a spring member for elastically biasing the screw toward the tip side. A material supply device comprising: 3. The material supply device according to claim 1, wherein the inner surface of the tip of the cylinder and the tip of the screw are
A material supply device having a contact structure capable of opening and closing a material supply port of a cylinder. 4. The material supply apparatus according to claim 1, wherein at least the tip of the screw has a conical shape. 5. The material supply device according to any one of claims 1 to 4, wherein auxiliary screws are arranged radially outside the screw inside the cylinder.